Premises and Equipment Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 21,066
Operating Leases, Future Minimum Payments, Due in Two Years	20,504
Operating Leases, Future Minimum Payments, Due in Three Years	19,718
Operating Leases, Future Minimum Payments, Due in Four Years	19,460
Operating Leases, Future Minimum Payments, Due in Five Years	19,221
Operating Leases, Future Minimum Payments, Due Thereafter	58,076
Operating Leases, Future Minimum Payments Due	$ 158,045